Variable Interest Entities (Narrative) (Details)	9 Months Ended	12 Months Ended
	Sep. 30, 2013 jvs property	Dec. 31, 2012 property
Consolidated Variable Interest Entities [Member]
Variable Interest Entity [Line Items]
Number of VIE real estate joint ventures	2
Number of neighborhood/community shopping centers	28	30
Through Secured Loans [Member] | Unconsolidated Variable Interest Entities [Member]
Variable Interest Entity [Line Items]
Number of VIE real estate joint ventures	1	2